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Based on the spectrometry, a new method by derivative visible spectrophotometry for the determination of atrazine was built which was called P-aminoacetophenone Spectrophotometric. Results showed that this method presented favorable accuracy and precision within the range of 0.01 0.16mg/L, and R2=0.9997%. Moreover, the optimal operating condition of measurement method was fixed as maximum absorption=464nm;...
Polyhydroxyalkanoate (PHA) is thermoplastics synthesized by bacteria under stress growth condition. In this experiment, effect of temperature on PHA accumulation is investigated. PHA is produced by activated sludge with acetate as a carbon source under imbalanced nutrition condition. Two sequencing batch reactors are operated in anaerobic-aerobic cycle with P limitation and N limitation separately,...
To assess the feasibility of actual domestic wastewater treatment by an expanded granular sludge bed (EGSB) reactor at ambient temperature, the startup and stable operation performance of an EGSB reactor seeded with digestion sludge treating actual domestic wastewater was monitored in the range of 13~25degC. The results showed that there was no adaptive stage to treat actual domestic wastewater using...
Chemical precipitation with alum was employed as the post-treatment of a micro-aerobic EGSB system treating domestic wastewater to reduce TP concentration. Effectiveness evaluation focused on the influences of reaction/settling time, pH, coagulant dosage and temperature when original TP ranged in 2-8 mg/L. It was found that 20 min was appropriate for flocculation or sedimentation. Samples with original...
An expanded granular sludge bed (EGSB) reactor was employed to promote COD removal from domestic wastewater in psychrophilic range (13-26degC). Reactor performance and sludge properties were investigated. It was found that COD removal increased with the increase of organic loading rate (OLR) and the shortening of HRT. At temperature above 15degC, the average COD removal were 75, 81, 81 and 82% with...
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